Driving the watertreatment industry

R o t a t i n g E l e c t r i c a l M a c h i n e s

9925E

9925E Issue 2.1e Driving the water treatment industry

Reliably driving the sewage treatment industry

2

Typical sewage treatment plant

Reliability is considered one of the most critical factors within the sewage

process.

The arduous duty and hostile environment commonly found on an aerator

application can, in many cases, prove to be a challenge to equipment

suppliers. However, the high quality of build and proven robustness of the

Brook Crompton ‘W’ motor is ideally suited to the harsh environments and its

performance exceeds the required standards. Increasing numbers of

companies now specify ‘W’ motors when placing orders upon equipment

manufacturers, which in turn ensures the total package fully complies to the

required specification.

Brook Crompton ‘W’ motors are ideal for the sewage treatment industry as

they are quiet and reliable with the flexibility to suit a wide range of

applications. Typical examples of these include high flow screens, sewage

screening inlets, brush aerators, common aerators, screw pumps and the

many other varieties of associated pump applications.Shepshed Treatment Works, Severn Trent

Worsborough site, Yorkshire Water

Photograph courtesy of Three Star Engineering

Bedford Sewage Works, Anglian Water

Photograph courtesy of Jones and Attwood Limited

9925E Issue 2.1e Driving the water treatment industry

Efficiently driving the water treatment industry

3

Over 90% of all industrial electrical energy consumed within the water industry

drives an electric motor. With the majority of equipment delivering the clean water

process operating continuously, the efficiency of the process is critical to maintaining

low energy costs.

Therefore, it is becoming more and more common for water companies to specify

equipment with minimum efficiencies when either upgrading existing plant or

installing new processes. The high efficiency levels of the ‘W’ motor meet these

standards and ensure that operating costs are kept to a minimum.

Another trend within the industry is the use of variable speed drives within many of

the water processes. This can help process control and potentially save energy,

particularly on pump applications where the speed can be regulated to match

demand.

The ‘W’ motor is a design that has been successfully used with many types of stand-

alone inverter and the range has now been updated to include a variant with an

integrated inverter. This ability of the ‘W’ motor makes it an ideal choice for reducing

energy costs.

Davyhulme Waste Water Treatment Works,

North West Water

Photograph courtesy of Bechtel Water Technology

Brook Crompton not only supplies ‘W’

motors to the UK water industry, but to

water industries world-wide. The

Mafraq Treatment Plant in Abu Dhabi is

such an example, as is the New Joyce

Road Water Processing Plant at

Tauranga, New Zealand. The Brook

Crompton ‘W’ motors used to drive the

water pumps contributed to the setting

of new standards for water quality for

that country and produce almost three

times more water than the old water

supply.

New Joyce Road Water Processing Plant,

New ZealandMafraq Treatment Plant, Abu Dhabi

Typical water treatment plant

9925E Issue 2.1e Driving the water treatment industry

and the WIMES 3.03 specification

4

Water companies

supply current specifications.

Final document produced

feedback stored for future review.

Pump centre

reviews, highlights issues,

produces composite

document.

Manufacturers

and suppliers

comment on draft.

Water companies

review drafts, challenge

and evaluate.

Output kW

Eff

icie

ncy %

5.5 7.5 11 15 18.5 22 30 37 45 55 75 90 110 132 150 185 200 250 280 315 355 400

84

86

88

90

92

94

96

98

4 pole full load

For WIMES 3.03WIMES minimum efficiency requirements

‘W’ efficiencies WIMES efficiencies

The Water Industry Mechanical and

Electrical Specification (WIMES) 3.03

defines minimum standards of

performance and construction of low

voltage motors, and was drawn up with

the assistance of water companies,

manufacturers and suppliers.

Aims of WIMES 3.03● to achieve lowest lifetime costs

● to achieve competitive initial

purchase price

● to determine subsequent operating

and maintenance expenditure

● to specify fit for purpose plant and

equipment

● to allow individual manufacturers to

compete on an equal footing

Benefits of WIMES 3.03● clearly indicates water company’s

requirements

● defines minimum acceptable

standards

● concentrates on functionality and

lifetime performance

● reduces project timescales due to

standardisation

● provides a forum for exchange of

ideas and experiences

● avoids duplication of effort by water

companies’ contractors, consultants

and suppliers

Roger Marlow, WIMES co-ordinator at

The Pump Centre, said:

“The technical assistance andguidance given by Brook Cromptonthroughout the compiling of theWIMES 3.03 specification wasinvaluable. We thank them for theirco-operation.”

Roger Marlow Tel. 01925 252061 Fax. 01925 252579

Eriks Zvaigzne Brook Crompton Tel. 01484 557200 Fax. 01484 557201

Water companies

involved with the

WIMES 3.03

specification include:

For further information on the WIMES 3.03 low voltage AC electric motor specification please

contact either:

‘W’ and WIMESThe ‘W’ motor not only complies with

the WIMES efficiencies but in many

cases exceeds them, as shown in the

table above. The energy cost benefits

that can be gained from using high

efficiency ‘W’ motors are shown on the

page opposite.

9925E Issue 2.1e Driving the water treatment industry

Reducing lifetime costs

5

2.2 4 7.5 15 22

Output kW

37 55 90 132 185

Noise level reduction

Typical standard motor ‘W’ design motor

Mean

so

un

d p

ressu

re level at

1m

on

no

-lo

ad

dB

(A)

50

60

70

80

90

A typical motor consumes 100 times its

purchase price in electricity cost within

its lifetime. Typical annual energy

savings of a high efficiency motor

compared to a standard motor, based

on continuous running at 4 pence per

unit are:

4kW – £53, 110kW – £1193

When you consider the purchase price

is only 10% of the first year’s

continuous running cost, the choice of

a ‘W’ motor will quickly pay for itself.

Reduced running costs, reduced noise

levels, total adaptability, complete

reliability and minimal maintenance;

the ‘W’ range of motors represents the

latest in electric motor technology –

and the last word in cutting your

energy costs.

2.2

16,000

Running 8000 hours per annum @ full load, 4p/kWh

*‘W’ design over standard motor

12,800

9,600

6,400

3,200

0

4 7.5 15 22

Output kW

37 55 90 132 185

‘W’ running cost savingsTypical 5 years savings compared with motor purchase price

Motor purchase price ‘W’ running cost savings*

Benefits to the water industry

• low running costs due to highefficiency and power factor

• ability to handle a wide varietyof applications due to hightorque and low current

• improved reliability due to IP55protection and high quality ofbuild BS/EN/ISO 9001:1994

• reduced maintenance costsdue to high build specification

• ease of installation due to highdegree of mechanical flexibility

• peace of mind due to full 2 year warranty

• ability to offer fully integrateddrive packages includingassociated gear units,transmission products andcontrol gear (including variablespeed drives)

9925E Issue 2.1e Driving the water treatment industry

Global expertise

6

Brook Crompton ‘W’ motors are used

worldwide in sectors as diverse as food

processing, oil and gas exploration, industrial

manufacturing and building

and property services.

Brook CromptonThe Brook Crompton name has

long been recognised as

representing innovation and quality

in the design and manufacture of

electric motors. Part of the Invensys

group, Brook Crompton operates

worldwide, employing 5000 people.

The company’s policy of customer-

focused research and development,

together with a real understanding

of the requirements of the markets

it serves, has contributed towards

an unrivalled international

leadership in cutting-edge

technology, design and

manufacture.

Brook CromptonSt Thomas’ Road HuddersfieldWest Yorkshire HD1 3LJ UKTel: +44 (0) 1484 557200Fax: +44 (0) 1484 557201E-mail: csc@brookcrompton.comInternet: www.brookcrompton.com

R o t a t i n g E l e c t r i c a l M a c h i n e s

Printed in Englandnjh090/07/02 9925E issue 2.1e

© Copyright 2002. Brook Crompton. All rights reserved.

Every care has been taken to ensure the accuracy of the information

contained in this publication, but, due to a policy of continuous

development and improvement the right is reserved to supply products

which may differ slightly from those illustrated and described in this

publication